feat!(sdbapi): restructure, expand user details

fix(sdbapi): simplify returns for game endpoints

feat(sdbapi): return EndedAt from gameinfo

fix(sdbapi): remove redundant checks for user

feat(sdbapi): simplify verifying if a user exists

feat(sdbapi): helper for getting user by email

feat!(sdbapi): change errors to apierror

WIP(sdbapi): game info API endpoint